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2003-09-16  Ulrich Drepper  <drepper@redhat.com>

	* attr.c (pthread_getattr_np): Correctly fill in the stack-related
	values for the initial thread.
This commit is contained in:
Ulrich Drepper
2003-09-17 06:44:18 +00:00
parent a243f94e36
commit 92ce46766b
4 changed files with 145 additions and 4 deletions
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61
linuxthreads/attr.c
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@@ -15,6 +15,9 @@
/* Handling of thread attributes */
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
@@ -344,6 +347,7 @@ int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
{
pthread_handle handle = thread_handle (thread);
pthread_descr descr;
int ret = 0;
if (handle == NULL)
return ENOENT;
@@ -364,6 +368,7 @@ int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
attr->__inheritsched = descr->p_inheritsched;
attr->__scope = PTHREAD_SCOPE_SYSTEM;
#ifdef _STACK_GROWS_DOWN
# ifdef USE_TLS
attr->__stacksize = descr->p_stackaddr - (char *)descr->p_guardaddr
@@ -399,5 +404,61 @@ int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
# endif
#endif
if (attr->__stackaddr == NULL)
{
/* Defined in ld.so. */
extern void *__libc_stack_end;
/* Stack size limit. */
struct rlimit rl;
/* The safest way to get the top of the stack is to read
/proc/self/maps and locate the line into which
__libc_stack_end falls. */
FILE *fp = fopen ("/proc/self/maps", "rc");
if (fp == NULL)
ret = errno;
/* We need the limit of the stack in any case. */
else if (getrlimit (RLIMIT_STACK, &rl) != 0)
ret = errno;
else
{
/* We need no locking. */
__fsetlocking (fp, FSETLOCKING_BYCALLER);
/* Until we found an entry (which should always be the case)
mark the result as a failure. */
ret = ENOENT;
char *line = NULL;
size_t linelen = 0;
while (! feof_unlocked (fp))
{
if (__getdelim (&line, &linelen, '\n', fp) <= 0)
break;
uintptr_t from;
uintptr_t to;
if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) == 2
&& from <= (uintptr_t) __libc_stack_end
&& (uintptr_t) __libc_stack_end < to)
{
/* Found the entry. Now we have the info we need. */
attr->__stacksize = rl.rlim_cur;
attr->__stackaddr = (void *) to;
/* We succeed and no need to look further. */
ret = 0;
break;
}
}
fclose (fp);
free (line);
}
}
return 0;
}